Numbers n such that sigma(phi(n))/sigma(n) is an integer >= 4.

Terms

a(0) =121679a(1) =1043909a(2) =2350171a(3) =2918263a(4) =3396103a(5) =3566807a(6) =3688067a(7) =4019467a(8) =4562827a(9) =5963407a(10) =7300697a(11) =7485979a(12) =7853933a(13) =8103301a(14) =8364151a(15) =9237779a(16) =9514213a(17) =9638527a(18) =10531123a(19) =11094619a(20) =11384447a(21) =12721937a(22) =13576267a(23) =15331313